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There are many forms of energy - mechanical, chemical, electrostatic, heat,
nuclear. In any isolated system, energy can be transformed from one kind to
another, but the total amount of energy is constant (conserved). Example: a
battery contains chemical energy and can be used to produce mechanical energy.
Example: when a block slides over a rough surface, the force of friction gives
rise to the heating of block and surface. As a result, mechanical energy is
transformed into heat energy, but total energy is constant.
In this chapter, we are interested in two kinds of mechanical energy:
- Kinetic Energy ( KE ) (energy of motion)
- Potential Energy ( PE ) (energy of position)